Power mixer unit



Dec. 22, 1953 F. C. SCHWANEKE 2,663,552

POWER MIXER UNIT Filed Sept. 22, 1951 2 Sheets-Shes?I l F. C SCHWANEKEPOWER MIXER UNIT Dec. 22, 1953 Flled Sept 22 1951 Patented Dec. 22, 1953POWER MIXER UNIT Fred C.y Schwaneke, Chicago, Ill., assignor to DormeyerCorporation, Chicago, Ill., a corpo ration of Illinois ApplicationSeptember 22, 1951, Serial No. 247,794

16 Claims.

This invention relates generally to electrically powered householdmixers and more particularly to a mixer power unit having an improvedbeater release and power take-off shaft arrangement.

The food mixer power unit of this invention In the drawings:

Fig. l is a side view, partially in section, of a food mixer power unitprovided with a beater release and power take-01T according to thislnvention;

is similar in some respects to that disclosed in Fig. 2 is a front endview of the unit;

the Knapp Patent No. 2,048,455 for Food Mixing Fig. 3 is another endview showing the handle Device with Beater Elector, reference to whichin the position it occupies when the power takeis hereby made; but thebeater ejector mecha- Off Shafiis being Used;

nism of this invention constitutes a substantial Fis'. 4 is an end viewof the power unit With improvement over` the Knapp ejector inasmuch thehandle and rotatable end bell as well as ceras it accomplishes all ofthe results of that ejectain internal COVeI'S remOVed t0 ShOW the geartor and employs a greatly simpliiied mechanism arrangement;

which is more positive in its action and more Fig. 5 is an end viewsimilar to Fig. 4, but With rugged in its inherent construction. Onll7the handle and end bell removed;

Another feature of the mixer power unit of Fig. 6 is a side view of thepOWer Unit with an this invention is that a power take-oir shaft forattachment tool mounted in the power take-01T attachments isconveniently provided on the socket; and front end of the power unit,and the various Fig- 7 iS a OD View, Partially in SeCiiiOn, ShOW- partsof the beater release are arranged so that ing the pOWer take-Off SOCketarrangement. the power take-orf shaft elements do not inter- Afundamental Concept of this invention is to fere with the beater releaseelements. Certain provide a food mixer DOWel Unit having reInOV-eiements of the beater release mechanism are able interdigitetingbeaters, a power take-01T employed to provide a. conveniently actuatedshaft on the front end of the unit, and a beater iooking device for themixer attachment such ejector mechanism Comprising a rotatable end as ajuicer, grinder or other power tool driven bell all the I'Ont end 0flChe Unit Carrying a by the power take-oil" shaft. Moreover, the handlewhich actuates a moveable beater eJ'eClbeater release elements areemployed to enclose ing element When I'Otated and Which Serves as a thepower take-ofi" socket when it is not used. ClOSllre and an attachment100k for the Power Accordingly, one object of this invention is totake-off socket. The rotatable end bell is Droprovide a icon mixer motorunit for-driving a "U vided with @am surfaces which act directly uponpair of interdigitating beaters having a novel a resilienllly Supportedelement having engaging mechanism for releasing' said beaters from drivesleeves to force the beaters downwardly in their engagement, the releasemechanism being posidrive spindles to effect their release, as thehandle tive in its action yet not interfering with a. power iS rotated.take-off mechanism which is also provided in ya T0 aid in understandingthe invention, the the motor unit and so constructed as to permit heaterrelease mechanism Will he described first, the beaters to be locked indrive position during followed by a description of the power take-offuse of the power take-oir shaft. mechanism. It is to be'understood,however, that Another object is to provide a Convenient means the twomechanisms are very closely interrelated Vfor locking a tool attachmentin the power takei0 and that the parts of one mechanism perform olifsocket, the locking means being actuated by dna-1 functions in theSeCOnd. -the same handle which operates the beater re- The DOWel unit l0COmDriSeS an external lease mechanism casing l which is adapted to besupported on a A further object is to provide a power unit pedestal (notshown) at one end, and carries a having adequate ventiiation openings atthe front pair of removable beaters l2 at the other end. end. WhCh areOpen t0 provide a free flow of air The casing Il contains an electricmotor (not over the gear housing'and the internal parts of Shown) whosearmature l 3 is provided with` a the unit regardiess of whether the unitis being Worm I4. This worm is disposed between two used to drive thebeaters or an attachment. Worm Wheels i5 Carried by the beater driveOther objects and advantages of the mixer power unit of this inventionwill present themselves to those familiar to the art on reading thefollowipo specincation in conjunction with the drawing and the appendedclaims,

spindles i 6. These spindles constitute sleeves which are journalled inspindle bearings provided at the front end of the unit and the bores ofthe sleeves receive the upper ends of the beater shafts l2.

Resilient retainer and clutch means are provided to hold the beatershafts I2 in the spindles I6 in the positions shown in Figs. 1, 2 and 4.The retaining and clutching arrangement is conN ventional and may beaccomplished in any one of a number of different ways. For example; asingle resilient element I2a can be provided on each beater shaft whichengages a kerf lfb in the spindle to key the'two together and to preventdownward movement of the shaft in the spindle I2C. Another arrangementis to crosskerf the upper ends of the shafts and provide a pin at thetop of the spindle for engaging the kerf, independent resilient meansbeing utilized to prevent the beaters from dropping out of the spindles.

Thus, the beater spindle relationship is such that the beaters areautomatically retained in the spindles in drive relationship when theyhave been pushed all the way into the spindles, and the driverelationship is broken by moving the shafts downwardly in the spindlesto unclutch the shafts and release them' so that they are free to dropout of the spindles.

The beater release mechanism of this inven` tion provides a convenientmeans for simultaneously moving both beater shafts downwardly in theirspindles to declutch them from drive relationship and permit them todrop out of the spindles. The release mechanism comprises a handle I8, arotatable end bell I9 to which the handle is attached and a pair ofresiliently mounted ejector sleeves 6 which cooperate with the shoulderelements 2l provided on the shafts I2. The end bell I3 is substantiallycircular and is journalled for rotation about the long axis of thecasing in a circular groove or recess 23 provided on the end of thecasing II. To hold the end bell I9 in engagement in the groove 23, ascrew 23 and spring 25 are employed. The screw is received in a threadedsleeve 25 attached to a cover plate 21 which encloses the gears. Thehead of the screw 24 and the spring are received in a small socket 28provided in the front end of the bell I9 in such fashion that the springurges the bell towards the casing II. When in its upright position thehandle I8 also serves as a carrying handle for the power unit permittingthe unit to be used separately from its'supporting base if desired.

The ejector sleeves 23 are attached to a cam follower element,preferably formed integrally therewith, which is in turn secured to theend of a leaf spring 3l whose other end is bolted to the bottom of thecasing II. Thus, the elements 2li are normally held in the positionshown in Fig. 1 but may be bent downwardly from the casing to theposition shown in broken lines in Fig. 2. When this is done, the ends ofthe elements 20 engagethe shoulders 2l on the beater shafts I2 movingthe shafts downwardly a short distance and disengaging them from thespindles, the frictional drag exerted by the elements 23 irnmediatelybegins to slow the beater shafts I2 when they have been unclutched, andthe beaters are effectively released from drive engagement and free todrop out of the spindles I6.

To effect downward movement of the release elements 20, a cam surface 33is provided on the end bell I9. The cam action of this surface as thehandle I8 is rotated is best shown in Fig. 2. On examination of thisfigure, it will be apparent'that'the surface 33 projects outwardlybeyond the nominal diameter of the housing II and engages the camVfollower element 36 as the handle I8 is moved from the normal positionshown in solid lines in Fig. 2, to the position shown in dotted lines.To balance the appearance of the end bell a similar projecting surface3@ is provided on the opposite side of the unit. Thus, as the handle I8is moved away from the upright position, rotating the end bell it, thecam surface 33 engages the follower plate 33 to move the sleeve elements23 downwardly and eject the beaters. Further rotation of the handlebeyond the position shown in the broken lines of Fig. 2 permits theplate 30 to rise carrying the elements 26 back to their normal position.Consequently, the beaters may be ejected either by moving the handledownwardly away from the upright position or by raising it from aposition wherein it extends to the side of the mixer towards the uprightposition. This arrangement also permits the beaters to be installed whenthe handle is in the horizontal position as is sometimes desirable.

The handle I8 is normally secured in the ug right position by the upwardforce of the p ate against the two cam surfaces 33 and 34. Thus there isno need to provide a detent or latch for this purpose. Conventional stopmeans (not shown) are provided to prevent the handle it from beingrotated past the upright positioinin the clockwise direction as viewedin Fig. 2.

The power take-off shaft 36 is disposed directly below the Worm I4 andis `iournalled in bearings 3'! and 33. The smaller bearing 31 is pressedinto a socket provided in the die-cast gear housing 4D. The largerbearing 38 is pressed into a larger circular socket opening 33 providedin the gear housing cover plate 26. 'The front end of the shaft 36 iskerfed to provide a clutch drive for the driven shaft of the attachmenttool which is inserted in the front end of the socket 33. The shaft 33carries a Worm wheel 4| which is attached thereto by a set screw 32 andmeshes with a worm gear 43 provided on one of the beater spindles i3.Thus the worm I4 on the motor armature drives the worm Wheel I5 on thespindle which in turn drives the worm i3 to rotate the worm wheel 11i onthe power take-off shaft 36. The two worm drives effect a greatreduction in speed from the armature shaft to the power take-off shaftwith a consequent large increase in power at the shaft 33.

The attachment supporting socket 33 is preferably cylindrical but may beprovided with flat sides to prevent torque reaction rotation of theattachment such as the grinder 45 (Fig. 6) which is supported solely bythe socket 33. In the preferred illustrated embodiment the torquereaction is absorbed by an end bell I3, the opening d3 in bell I 3through which the attachment boss extends being iiat sided. The drivenshaft e9 (Fig. '7) of the attachment is separately journalled inside ofthe flat sided boss 46 which is received in the socket 39, the end ofthe driven shaft being shaped to fit into the kerf portion li'I providedin the end of the power take-off shaft 36 to establish a driverelationship between the power take-off shaft 36 and the driven shaft49. Thus, when an attachment is supported in the socket 3E, its drivenelement is clutched to the shaft 36 so as to be rotated at low speed andhigh power, and its stationary elements are supported and locked againstrotation by the socket 39 and the end bell The opening 68 in the endbell I9, instead of being directly beneath the handle I8, is locatedaway from the handle. Thus, the power takeoi socket 33 is exposed onlywhen the handle is 5 rotated 90 from the normal position as shown inFig. 3.

As shown in Fig. 3, the-opening 48 in the end bell is disposed slightlyeccentric to the socket 39 when the handle is in the position shown insolid lines. When the handle is seven or eight degrees below thisposition, as shown in broken lines, the opening 48 is concentric withthe socket S9. The reason for this is that the handle I8 and bell I9 areutilized to latch the attachment boss 46 in the socket 39 against axialdisplacement.

When the end bell I9 is in the position shown in solid lines the curvededge of the opening 43 engages a groove 59 provided in the side of theboss 46, and the boss is securely locked against withdrawal. To hold thehandle in this position a small spring 5I supported by the cover plate2'! and a lug 52 on the end bell I9 are employed. The lug 52 is solocated as to engage the spring when the handle I8 is horizontal. Whenthe handle I8 is pushed downwardly farther to the position indicated bybroken lines in Fig. 3, the lug 52 compresses the spring 5I, the springgoing solid when the opening i8 is concentric with the socket 39. Whenthe handle I S is released, of course, the

end bell i9 moves to the locked position of Fig. 3. Thus to insert orwithdraw the attachment boss 46 the handle i8 is simply presseddownwardly to the limit of travel, returning to the locking positionupon release. detent carried by the bell or actuated thereby could beused instead of the edge of the opening 4S to latch the boss 46 ifdesired.

If the end of the attachment boss 45 is beveled the edge of the opening48 may be camined sideways on insertion of the boss without pressing thehandle IS below the horizontal. It will be also appreciated that thehandle will serve as a readily available quick release of the attachmentif in an emergency quickness is urgent.

A novel arrangement has been provided for Ventilating the forward end ofthe power unit and also for camouflaging the socket opening 48 in theend bell I9. This is done by providing three louver openings 54 in theend bell I 9. The three openings 54 are spaced at right angles to oneanother and to the unlouvered opening 48. These openings permit the freeflow of air through the housing I I to cool the motor and the gearing,additional vent openings (not shown) being provided at the rear end ofthe casing Ii. Immediately behind the position occupied by the opening48 when the handle is in the normal upright position, a plurality oflouvers or gratings 55 are located. These louvers are provided in anL-shaped element 56 which is attached to the gear housing cover plate21, a space being provided immediately behind the louvers 55 so that airmay pass readily through them into the casing I I. Thus, when the handleis in the upright position, it appears as though four sets of louversare provided in the end bell i9 as shown in Fig. 2. Actually, however,only three sets are built integral with the bell, the fourth set being axture immediately behind the bell in the element 56. When the handle isrotated to the position shown in Fig. 3, the louvers 55 are inregistration with one set of louvers 54 in the end bell so that,actually, but three ventilation springs are in use during use of anattachment. This louver arrangement is quite desirable in that it notonly provides adequate ventilation at all times but also serves toprevent foreign objects from getting into the interior of the casing.Moreover, the take-ofi socket 39 is closed during mixing so that It willbe appreciated that a 2.2.

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objects cannot be inserted into it inadvertently.

The operation of the power unit has been described in the foregoingdescription of the comn ponents, but a rsum may prove helpful in fullyunderstanding the invention.V

Assuming that the power unit I9 is as shown in Fig. 2, and that a mixingoperation has been completed, the operator simply pushes the handle I8downwardly to the position shown by broken lines in Fig. 2 to rotate theend bell I9. This causes the cam surface 33 to depress the element 3Dand move the sleeves 20 downwardly unclutching the beaters I2 from driverelationship and releasing them so that they are free to drop out of thespindles I6. The handle I8 may then be returned to the upright positionor moved to a horizontal position to expose the power take-off socket39. In either event the beaters I2 may be reinserted at any time andthey will be clutched to the spindles I6 and retained therein.

The beater ejector mechanism is, of course= operative when the mixer isrunning and may be used to break the drive to the beaters in the eventthat a spatula, spoon or finger should be caught therein while the motorunit is being operated when attached to the stand.

To use the power take-off shaft 35 to drive an attachment such as thegrinder 45, juicer or shredder, the handle I8 is moved to the positionshown in broken lines in Fig. 3. The boss 4G on the attachment is theninserted into the socket 39, and the handle I8 is released to allow theedge of the opening 48 to spring into the retaining groove 50 providedin the side of the boss 46 to lock the attachment to the unit I0. Themounting of the attachment is preferably undertaken while the power unitis running, for this facilitates clutching of the driven shaft end intothe kerf 41.

On completion of the use of the attachment, the handle I8 is againpressed downwardly to withdraw the edge of the opening 48 and releasethe boss 46 so that the attachment may be removed from the unit. Toclose the power takeoff socket the handle is returned to the uprightposition carrying one set of the louvers 54 to a location over theopening.

From the foregoing description, it will be apparent that a superiorpower unit has been provided which is simply constructed, easy tooperate and otherwise fulfills the objects set forth herein.

Various changes or modifications in addition to those set forth hereinand such as will present themselves to those familiar with the art maybe made without departing from the spirit of this invention, whose scopeis defined by the following claims.

What is claimed is:

l. A mixer power unit having a casing open at the front end, a rotatableend bell having a power take-off socket opening therein and coveringsaid open end, a handle attached to said end bell for rotating same, acam surface on the periphery of said end bell normally disposed near thebottom of same, a pair of beater spindles within said casing, a pair ofbeaters, means re leasably retaining the shafts of said beaters in saidspindles in drive relationship, a heater ejector element resilientlymounted on the bottom of the front end of said casing and adapted to beengaged by said cam and moved downwardly as said handle is moveddownwardly from an upright position, said beater ejector element havinga sleeve portion surrounding each of said beaters which engages abuttingshoulders on the beaters to force same. downwardly, out of said spindleswhen the ejector elementvv moves downwardly, and a power take-.offsocket in said unit to one side of the center of said end bell, saidopening being so located in said end bell as to be aligned with saidsocket when said handle is rotated away from said upright position pastthe position at which said camy is operative.

2. A mixer power unit having a casing open at the front end, a rotatableend bell having a power take-off socket opening therein and coveringsaid open end, a handle attached to said end bell for rotating saine.cam means on said end bell, a pair of beater spindles within saidcasing, a pair of beaters, means releasably retaining the shafts of saidbeaters in said spindles in drive relationship, a beater ejector elementadapted to be actuated by said cam means and moved downwardly as saidhandle is moved downwardly from an upright positionJ Said beater ejectorelement having a sleeve portion surrounding each of said beaters whichengages abutting shoulders on the beaters to force same downwardly outof said spindles when the ejector element moves downwardly, and a powertake-off socket in said unit, said socket opening being s o located insaid end bell as to be aligned with said socket when said handle isrotated away from said upright position past the position at which saidcam means actuates the ejector element.

3. A mixer power unit having a casing open at the front end, a rotatableend bell having a power take-01T socket opening therein and coveringsaid open end, a handle attached to said end bell for rotating same, cammeans on said end bell, a beater spindle within said casing, a beater,means releasably lretaining the shaft of said beater in said spindle indrive relationship, a beater ejector element adapted to be engaged bysaid cam means and moved downwardly as said handle is moved downwardlyfrom an upright position, and a power take-olf socket in said unitdisposed eccentrically of said end bell, said opening being so locatedin said end bell as to be aligned with said socket when said handle isrotated away from said upright position past the position at which saidcam means is operative to eject said beater.

Y4. A mixer power unit having a casing open at the front end, arotatable end bell covering said open end and having a plurality oflouvered openings therein and an unlouvered opening, said openings beingequally spaced apart, a handle attached to said end bell for rotatingsame, a cam surface on the periphery of said end bell normally disposednear the bottom of same,

a pair of beater spindles within said casing, a pair of beaters, a powertake-off shaft between said spindles, said unlouvered opening beingdisposed adjacent to said socket when said handle is horizontal, astationary louvered element disE posed behind said unlouvered openingwhen said handle is upright, means releasably retaining the shafts ofsaid beaters in said spindles in drive relationship, and a beaterejector element resiliently mounted on said casing and adapted to beengaged by said cam and moved downwardly as said handle is moveddownwardly from an upright position, Said beater ejector element havinga portion at each of said beaters which engages the beater to `forcesame downwardly out of its spindle when the ejector element movesdownwardly, said cam being so located as to actuate the ejector duringmovement of said handle from said upright to said horizontal position.

.5 A mixer power unit having e casing open (ill 8 at the front end, arotatable end bell covering said open end and having a plurality oflouvered openings therein and an unlouvered opening, said openings beingequally spaced apart, a handle attached to said end bell for rotatingsame,y a cam surface on said end bell normally disposed near the bottomof same, a beater spindle within said casing, a removably receivablepower take-off shaft in said spindle at the front end of said unitbehind said bell, said unlouvered opening being disposed adjacent tosaid socket when said handle is horizontal, a stationary louveredelement disposed behind said unlouvered opening when said handle isupright, and a beater ejector element adapted to be engaged by said camsur.- face and moved downwardly as said handle is moved downwardly froman upright position, said beater ejector element at said cam being solocated as to actuate the ejector during movement of said handle fromsaid upright to said horizontal position.

6. A mixer power unit having a casing open at the front end, a rotatableend bell covering said open end, a handle attached to said end bell forrotating same, a cam surface on the pes riphery of said end bellnormally disposed near the bottom of same, a pair of beater spindleswithin said casing, a pair of beaters, means releasably retaining theshafts of said beaters said spindles in drive relationship, and a beaterejector element resiliently mounted on the bottom of the front end ofsaid casing and adapted to be engaged by said cam and moved downwardlyas said handle is moved downwardly from an upright position, said beaterejector element having a sleeve portion surrounding each or" saidbeaters for engaging abutting shoulders on the beaters to force samedownwardly out of said spindles when the ejector element movesdownwardly.

7. A mixer power unit having a mixing device detachably held in workingposition, a handle on a rotary spindle attached to a rotatable elementclosing the front end of said unit, said handle being adapted forcarrying the mixing unit when in an upright position and being movableaway from said position, a earn surface on said element disposed on thebottom of said power Unitvwhen the handle is in said upright positionand an ejector `element movably mounted on the bottom of said unit andhaving a cam follower surface thereon cooperating with said cam, saidelement also having a surface thereon for engaging said mixing device tomove same downwardly to detach same when said handle is moved away fromsaid upright position to cause said cam to move the ejector element.

8. A mixer power unit having a mixing device detachably held in workingposition, a handle pivotally supported upon the front end of said unitand adapted for carrying the mixing unit when in an upright position, acam surface on said handle normally disposed on the bottom of said powerunit, and an ejector element resiliently mounted on the bottom of saidunit and having a cam follower surface thereon cooperating with ysaidcam, said element also having a surface thereon for engaging said mixingdevice to move same downwardly to detach same when said handle is movedaway from said upright position to cause said cam to move the ejectorelement.

9. A mixer power unit having a mixing device detachably held in workingposition, a handle pivotally supported upon the front end or said unit,a cam surface on said handle disposed on the bottom of said power unit,and a movable ejector element mounted on the bottom of said unit andhaving a cam follower surface thereon cooperating with said cam, saidelement also having a surface thereon for engaging said mixing device tomove same downwardly to detach same when said handle is moved away froma normal position to cause said cam to move the ejector element.

10. In a mixer power unit the combination including a housing having anopen end, a driven shaft enclosed by the housing, a power take-off meansoperatively engaging the driven shaft and positioned within the housing,a bell movably mounted on the housing to close said end thereof, saidbell having a plurality of slotted portions and one opening therein, aslotted member secured to the housing normally in alignment with theopening for the passage of air, and means for moving the bell relativeto the housing to move the opening into alignment with the powertake-off means.

11. In a mixer power unit the combination including a housing having anopen end, a

driven shaft enclosed by the housing, a power take-off means operativelydriven by said driven shaft and located within the housing near the openend, an element movably mounted on the housing to close said endthereof, said element having an opening therein, a member secured to thehousing in normal alignment with the opening to ventilate the housingthrough the opening, and means for moving the element relative to thehousing to move the opening into alignment with the power take-offmeans.

12. In combination with a drive shaft, a motor and a housing enclosingsaid shaft and motor, a speed reducing unit secured within the housingand in operative engagement with the shaft, a power take-off socket forthe reducing unit positioned Within the housing, a bell rotatablymounted on the housing to close one end thereof, said bell having aplurality of slotted portions and one opening therein, said portions andopenings being disposed at equal angles to each other, a slotted platesecured to the housing in alignment with the opening for the passage ofair, and means for moving the bell to move the opening from a positionadjacent to the slotted plate to a second position in alignment with thesocket.

13. In combination with a drive shaft, a motor and a housing enclosingsaid shaft and motor, a speed reducing unit secured within the housingand in operative engagement with the shaft, a power take-off socket forthe reducing unit and -positioned within the housing, an elementrotatably mounted on the housing to close one end thereof, said elementhaving an opening therein, a plate secured to the housing normally inalignment with the opening for the passage of air, and means for movingthe bell so that the opening moves from a normal position adjacent tothe plate to a second position in alignment with the socket.

14. In combination with a drive shaft, a motor and a housing enclosingsaid shaft and motor, a speed reducing unit secured within the housingand in operative engagement with the shaft, a power take-off socket forthe reducing unit positioned within the housing, an element movablymounted on the housing to close one end thereof, said element having anopening therethrough for Ventilating the housing, a slotted platesecured to the housing in alignment with the opening, means for movingthe element to move the opening from a position adjacent to the slottedplate l, to a second position in alignment with the socket,

means for locking an attachment in said socket, and means actuated bymotion of said element for releasing said locking means.

15. In a mixer power unit the combination including a housing having anopen end, a driven shaft enclosed by the housing, a power take-ofi meansoperatively engaging the driven shaft and positioned within the housing,an element movably mounted on the housing to close one end thereof, saidelement having an opening therein for Ventilating the housing, means formoving the element relative to the housing to move the opening intoalignment with the power take-off means, a retractable detent forlocking an attachment in operative engagement with the power take-offmeans, and means actuated by slight movement of said element forretracting said detent to release the attachment.

16. In ya mixer power unit the combination including a housing having anopen end, a driven shaft enclosed by the housing, a power take-off meansoperatively engaging the driven shaft and positioned within the housing,said housing having a power take-01T socket surrounding said I means forsupporting an attachment, a bell movably mounted on the housing to closeone end thereof, said bell having a plurality of slotted portions andone opening therein slightly larger than said socket for the passage ofair, a slotted member secured to the housing normally in alignment withthe opening, means for moving the bell relative to the housing to movethe opening into alignment with the power take-off means, a retractabledetent for locking the attachment in said power take-off socket, andmeans on said bell for retracting said detent when said bell is moved ashort vdistance beyond a position where the opening is in register withsaid socket.

FRED C. SCHWANEKE.

References Cited in the flle of this patent UNITED STATES PATENTS NumberName Date 1,868,587 Richards July 26, 1932 2,048,455 Knapp July 2l, 19362,293,959 Wright Aug. 25, 1942 2,312,125 Setterlund Feb. 23, 19432,552,972 Jepson May 15, 1951

